Docker-compose 检查 mysql 连接是否准备好

2022-01-14 00:00:00 docker dockerfile docker-compose mysql

我正在尝试确保我的应用容器在 db 容器启动并准备好接受连接之前不会运行迁移/启动.

I am trying to make sure that my app container does not run migrations / start until the db container is started and READY TO accept connections.

所以我决定使用运行状况检查并依赖于 docker compose file v2 中的选项.

So I decided to use the healthcheck and depends on option in docker compose file v2.

在应用程序中，我有以下内容

In the app, I have the following 

app:
    ...
    depends_on:
      db:
      condition: service_healthy

另一方面，数据库具有以下运行状况检查

The db on the other hand has the following healthcheck

db:
  ...
  healthcheck:
    test: TEST_GOES_HERE
    timeout: 20s
    retries: 10

我尝试了几种方法，例如:

I have tried a couple of approaches like :

  1. 确保已创建 db DIR<代码>测试:[CMD"，test -f var/lib/mysql/db"]
  2. 获取mysql版本:<代码>测试:["CMD", "echo 'SELECT version();'| mysql"]
  3. Ping 管理员(将 db 容器标记为健康但似乎不是有效的测试)<代码>测试:[CMD"、mysqladmin"、ping"、-h"、localhost"]

有没有人可以解决这个问题?

Does anyone have a solution to this?

推荐答案

version: "2.1"
services:
    api:
        build: .
        container_name: api
        ports:
            - "8080:8080"
        depends_on:
            db:
                condition: service_healthy
    db:
        container_name: db
        image: mysql
        ports:
            - "3306"
        environment:
            MYSQL_ALLOW_EMPTY_PASSWORD: "yes"
            MYSQL_USER: "user"
            MYSQL_PASSWORD: "password"
            MYSQL_DATABASE: "database"
        healthcheck:
            test: ["CMD", "mysqladmin" ,"ping", "-h", "localhost"]
            timeout: 20s
            retries: 10

在 db 容器健康之前，api 容器不会启动(基本上直到 mysqladmin 启动并接受连接.)

The api container will not start until the db container is healthy (basically until mysqladmin is up and accepting connections.)

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